The court also fined him Tk10,000.
Judge of Women and Child Repression Prevention Tribunal (also District and Session Judge) M Helal Uddin pronounced the verdict.
The court official said the convict is M Abdur Razzak, 55, son of late Chhamu Miah of Maizbari Panchmile village of the upazila.
According to the prosecution story, Rezzak married Julekha Khatun, 40, some 22 years ago and the couple had nine children.
Rezzak chopped and slaughtered his wife Julekha for dowry on March 14 in 2013.
After the incident, M Azharul Islam, younger brother of the victim, filed a case with Kotwali Thana against Razzak.
Police after investigation submitted charge-sheet with the court against Rezzak.